# GT.fmt_roman()
Format values as Roman numerals.
Usage
``` python
GT.fmt_roman(
columns=None,
rows=None,
case="upper",
pattern="{x}",
)
```
With numeric values in a **gt** table we can transform those to Roman numerals, rounding values as necessary.
## Parameters
`columns: SelectExpr = None`
The columns to target. Can either be a single column name or a series of column names provided in a list.
`rows: int | list[int] | None = None`
In conjunction with `columns=`, we can specify which of their rows should undergo formatting. The default is all rows, resulting in all rows in targeted columns being formatted. Alternatively, we can supply a list of row indices.
`case: str = ``"upper"`
Should Roman numerals should be rendered as uppercase (`"upper"`) or lowercase (`"lower"`) letters? By default, this is set to `"upper"`.
`pattern: str = ``"{x}"`
A formatting pattern that allows for decoration of the formatted value. The formatted value is represented by the `{x}` (which can be used multiple times, if needed) and all other characters will be interpreted as string literals.
## Returns
`GT`
The GT object is returned. This is the same object that the method is called on so that we can facilitate method chaining.
## Examples
Let's first create a DataFrame containing small numeric values and then introduce that to GT(). We'll then format the `roman` column to appear as Roman numerals with the `fmt_roman()` method.
``` python
import pandas as pd
from great_tables import GT
numbers_tbl = pd.DataFrame({"arabic": [1, 8, 24, 85], "roman": [1, 8, 24, 85]})
(
GT(numbers_tbl, rowname_col="arabic")
.fmt_roman(columns="roman")
)
```
| | roman |
|-----|-------|
| 1 | I |
| 8 | VIII |
| 24 | XXIV |
| 85 | LXXXV |